6f-2f+7f+21-9=78

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Solution for 6f-2f+7f+21-9=78 equation: 



6f-2f+7f+21-9=78

We move all terms to the left:

6f-2f+7f+21-9-(78)=0

We add all the numbers together, and all the variables

11f-66=0

We move all terms containing f to the left, all other terms to the right

11f=66

f=66/11

f=6

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